<script setup lang="ts">
import { computed, ref, watch } from 'vue';

// 定义水果对象的类型
interface Fruit {
  id: number
  icon: string
  isChecked: boolean
  num: number
  price: number
}
//水果列表
const  defaultList=ref<Fruit[]>([
   {
    id: 1,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png',
    isChecked: true,
    num: 2,
    price: 6,
  },
  {
    id: 2,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png',
    isChecked: false,
    num: 7,
    price: 20,
  },
  {
    id: 3,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png',
    isChecked: false,
    num: 3,
    price: 40,
  },
  {
    id: 4,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png',
    isChecked: false,
    num: 10,
    price: 3,
  },
  {
    id: 5,
    icon: 'https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png',
    isChecked: false,
    num: 20,
    price: 34,
  },
  ],)

  const fruits=localStorage.getItem('list')===null?ref<Fruit[]>(defaultList.value):ref<Fruit[]>(JSON.parse(localStorage.getItem('list')!))
  
  watch(fruits,()=>{
    localStorage.setItem('list',JSON.stringify(fruits.value))
  },{deep:true})
//删除水果
const deleteFruit=(id:number)=>{
  fruits.value=fruits.value.filter(item=>item.id!==id)
}
//添加水果
const addFruit=(id:number)=>{
  const fruit=fruits.value.find(item=>item.id===id)
  fruit && fruit.num++
}
const subFruit=(id:number)=>{
  const fruit=fruits.value.find(item=>item.id===id)
  fruit && fruit.num--
}
//全选和反选
const isAll=computed({
  get(){
    return fruits.value.every(item => item.isChecked)
  },
  set(value){
    fruits.value.forEach(item => item.isChecked = value)
  }
})

const totalCount=computed(()=>{
  return fruits.value.reduce((sum,item)=>{
    if(item.isChecked){
     return item.num+sum
    }else{
      return sum
    }
  },0)
})
const totalPrice=computed(()=>{
  return fruits.value.reduce((sum,item)=>{
    if(item.isChecked){
     return item.price*item.num+sum
    }else{
      return sum
    }
  },0)
})
</script>

<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruits.length">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div class="tr active" v-for="item in fruits" :key="item.id">
            <div class="td"><input type="checkbox" v-model="item.isChecked" /></div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button class="decrease" :disabled="item.num<=1" @click="subFruit(item.id)"> - </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="addFruit(item.id)"> + </button>
              </div>
            </div>
            <div class="td">{{ item.price*item.num}}</div>
            <div class="td"><button @click="deleteFruit(item.id)">删除</button></div>
          </div>

          <!-- <div class="tr">
            <div class="td"><input type="checkbox" /></div>
            <div class="td"><img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png" alt="" /></div>
            <div class="td">7</div>
            <div class="td">
              <div class="my-input-number">
                <button disabled class="decrease"> - </button>
                <span class="my-input__inner">1</span>
                <button class="increase"> + </button>
              </div>
            </div> 
            <div class="td">14</div>
            <div class="td"><button>删除</button></div>
          </div> --> 
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isAll"/>
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{ totalPrice }}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算({{totalCount}})</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
</template>

<style scoped>
@import './style/inputnumber.css';
@import './style/index.css';
</style>